kml first commit

2026-04-27 12:48:37 +05:30
commit ac72da88f2
48 changed files with 24957 additions and 0 deletions
--- a/README.md
+++ b/README.md
@@ -0,0 +1,176 @@
+# KML Map Tool — User Guide
+
+Tauri 2 desktop app for reviewing, correcting and exporting fixed-asset / range-asset annotations produced by the dashcam labelling pipeline. Replaces the legacy FastAPI + Leaflet tools.
+
+---
+
+## Quick start
+
+1. **Login** — pick or create a user when the app opens. The username is stamped on every audit-log entry.
+2. **Import data** — top-left **Import…** button:
+   - **Fixed assets (JSON)** — point assets like streetlights, signs.
+   - **Range assets (JSON)** — linear assets with start / mid / end (e.g., crash barriers).
+   - **KML scope polygon** — defines which assets are "in scope". Points outside the polygon are hidden by default.
+   - **OSM roads (GeoJSON)** — imported road network for snapping / direction lookups.
+   - **Metadata polyline (KML)** — vehicle GPS track from the source video; takes priority over OSM for direction inference.
+3. The map auto-centers on the first imported asset. Pan / zoom triggers viewport-bounded fetches (debounced) to keep the deck.gl rendering snappy.
+
+---
+
+## Map basics
+
+- **Basemaps** — Basemap selector at the top. Default: **Google Satellite (deep zoom)** which uses Google Earth tiles and goes deeper than the regular Google Satellite layer (helpful at z≥22 to see streetlights / road surface).
+- **Compare mode** — secondary basemap layered side-by-side via the Compare toggle.
+- **Layer toggles** — Fixed / Range / OSM / Scope / Metadata visibility.
+- **Filters panel** (left side) — narrow the visible set by Asset type, Side, Video, Asset name. Counts update live with the current viewport.
+- **Show out-of-scope / Show deleted** — toggles to expose hidden assets for inspection or restore.
+
+---
+
+## Selecting and editing one asset
+
+- **Click an asset** to select. The right-side **Selected** panel shows type, name, row_id, video, side. By default an image popup opens (toggle in Settings).
+- **Drag the pin** on the map to move the asset. Range assets show **S / M / E** (start / mid / end) draggable pins.
+- **`[` / `]`** keyboard shortcuts step through the visible filtered list.
+- **Reset to original** — restores the lat/lng captured at first import. Useful if a snap or drag went wrong.
+- **Snap to nearest road** — shifts the asset to the OSM road centerline or its lane-offset side. Direction priority: **metadata polyline → OSM `oneway` → position-based fallback**. Idempotent above 0.5 m drift.
+- **Side: Left / Right** — toggle without moving the geometry.
+- **Rename class…** — change `asset_name` (e.g. fix a mis-classified label). Pulls suggestions from `classes.txt`.
+- **Delete** — soft-delete (recoverable via Restore or Undo).
+- **Mark as anchor** — flag for the bulk **Distribute correction** flow (see below).
+
+---
+
+## Lasso selection (for bulk operations)
+
+- **Start lasso** then pick a shape: **circle**, **rect**, or **polygon**.
+- Polygon mode: click to add vertices, click near the first vertex (gold ring) or double-click to close. Pan / zoom while drawing — vertices stay anchored to the map.
+- **ESC** cancels at any time and clears the lingering polygon panel.
+- Once selected, you get bulk actions: **In-scope / Out-of-scope / Auto / Delete / Restore / Rename / Set Left / Set Right / Reset to original / Clear links**.
+- Polygon-only extras: **Auto-link L↔R**, **Auto-link by video**, **Auto-link nearest** (see Pair linking).
+
+---
+
+## Cross-side / cross-video pair linking
+
+Common situation: one physical asset (e.g., a median streetlight) is captured in two videos (LHS and RHS) and shows up as two near-duplicate points. Pair linking marks them as the same physical thing without deleting either.
+
+- **Auto-link** — draw a polygon lasso over the area, then pick the matching strategy in the polygon panel:
+  - **L↔R**: requires assets to have a `side` label; pairs Left with Right.
+  - **By video**: pairs across the two largest video buckets (use when both videos see the same poles from opposite sides).
+  - **Nearest**: pairs by proximity regardless of side or video. Use when `video_name` is `Not available` / NA.
+- **Pair max** slider (2–60 m, default 30 m) — the maximum allowed pair distance. Independent from the duplicate epsilon.
+- Manual links override auto-links:
+  - **Right-click an asset → right-click another** — locks them as a pair (pink line). The "anchor" asset gets a status-bar prompt.
+  - **Right-click two already-linked assets** — unlinks them.
+- **Click a link line** to select it; press **Delete** to clear that link.
+- Link colors: **pink = locked manual link** (survives Auto-link re-runs); **blue = auto link** (replaceable on the next re-run).
+- Unlink an asset directly via **Unlink** button on the selected panel.
+- After fixing a few wrong pairs manually, click **Auto-link** again — locked links stay; orphaned partners get re-matched among the remaining unlocked candidates.
+
+---
+
+## Duplicates
+
+- **Find duplicates** — scans the *currently visible viewport* for clusters of points within the chosen ε (metres). Zoom out to widen the search; zoom out fully to scan everywhere.
+- **Cross-video only** — restrict matches to pairs from different videos.
+- For each cluster you can **Delete losers** (keep one, delete the rest) or **Move losers out-of-scope**.
+
+---
+
+## Distribute correction (GPS bias fix)
+
+When the GPS is uniformly off for a whole video / stretch, you don't want to drag every streetlight by hand.
+
+1. **Filter** the map to the affected slice (e.g., `video=X`, `name=Streetlight`).
+2. Click an asset → **Mark as anchor** (gold ring appears).
+3. **Drag** the gold-ringed asset to where it should be. Repeat for as many anchors as you like.
+4. Click **Distribute correction** in the yellow panel that appears at the top of the actions sidebar.
+   - **1 anchor** → all visible assets shift by the same Δlat/Δlng (uniform).
+   - **2+ anchors** → row_id-sorted piecewise linear interpolation between consecutive anchors. Assets *outside* the first–last anchor span are not touched.
+5. **Undo** in Recent actions reverts the entire distribution in one step.
+
+Range assets (start / mid / end) translate as a rigid body — all three vertices shift by the same Δ.
+
+---
+
+## OSM road editing
+
+- **OSM tools…** modal — generate roads for the visible bbox (Overpass), import existing GeoJSON, export current roads, prune small road classes.
+- **OSM edit mode** — drag any road's vertex to refine the centerline. Markers are gated by zoom ≥ 14 and capped at 80 vertices / 40 ghost dots per viewport so the map stays responsive.
+- **Flip road direction** — cycle a road's `oneway` between 0 / 1 / -1 when it's wrong.
+- **Lane offset (m)** — controls the parallel offset used by snap-to-road. Range 0.1–30 m.
+
+---
+
+## Snap-to-road
+
+- **Per-asset** — Snap to nearest road on the selected panel.
+- **Bulk visible** — snap every visible fixed asset to the nearest road (50 m max).
+- **Snap by video** — snap every asset (fixed + range) for a given video.
+- Range assets snap all three vertices independently (not just mid).
+- Direction priority: **metadata polyline > OSM `oneway` > position-based**.
+
+---
+
+## Centerline override
+
+Some asset classes (expansion joint, vms gantry) belong on the road centerline, not the LHS/RHS offset. Settings → **Snap to centerline (instead of offset lane)** lets you tick those class names.
+
+---
+
+## Settings ⚙ modal
+
+- **Image popup**
+  - On / off (when off, marker pins still appear but no image opens on click).
+  - Width: S / M / L / XL.
+  - Aspect ratio: 16:9 / 4:3 / 3:2 / 1:1.
+- **Snap to centerline names** — list of asset_names that should snap to centerline.
+- **Image folder (offline)** — a local folder used to resolve `image_path` URLs to disk (HTTPS URLs always pass through unchanged).
+
+---
+
+## Export
+
+The **Export data…** button writes every non-deleted asset in one of four formats:
+
+- **`.json` Source JSON** — round-trippable. Same shape `import_fixed_assets` and `import_range_assets` accept (separate `fixed` and `range` arrays). Includes `image_path*`, `side`, `deleted`, etc.
+- **`.geojson`** — FeatureCollection. Points for fixed assets, LineStrings for ranges. Properties include `image_path*`, `link_pair_id`, `link_locked`, `in_scope`, `modified`.
+- **`.kml`** — Placemarks for GIS tools. Includes name, description, geometry.
+- **`.csv`** — full row dump for spreadsheets / external pipelines.
+
+OSM roads can be exported separately via **OSM tools… → Export current roads** (writes GeoJSON with `name`, `highway`, `oneway` preserved).
+
+---
+
+## Keyboard shortcuts
+
+| Key | Action |
+|---|---|
+| `[` / `]` | Step prev / next asset in the filtered list |
+| `ESC` | Cancel: lasso / link-pick / draw-road / road-edit / image popup |
+| `Delete` / `Backspace` | Unlink the currently-selected link line |
+
+---
+
+## Undo / Redo
+
+Every state-changing action writes an audit row. The **Recent actions** panel shows the last N. Click **Undo** on any row to revert; **Redo** on a previously undone row replays it. Multi-asset operations (bulk delete, distribute, auto-link) revert as a single atomic step. Road edits (OSM vertex drag, create / delete / flip) are not audited.
+
+---
+
+## Performance notes
+
+- Viewport-bounded fetch: `assets` only contains rows inside the current map bbox, debounced ~400 ms after pan / zoom.
+- Bulk operations use 500-id chunks to stay safely under SQLite's 999-bind-param ceiling.
+- Auto-link / Distribute over very large viewports may take several seconds at 50k+ rows; prefer narrowing with filters or zoom first.
+- Image prefetching warms the previous / next two thumbnails so `[` / `]` navigation feels instant.
+
+---
+
+## Troubleshooting
+
+- **No assets visible after import** — check Filters panel (especially Videos), Show out-of-scope toggle, and whether a stale KML scope from a previous import is filtering everything out.
+- **Streetlights not visible on satellite** — switch to **Google Satellite (deep zoom)** basemap and zoom to z≥22.
+- **Snap moves assets to the wrong side** — load the metadata polyline (gives true vehicle heading), or fix the OSM road's `oneway` direction.
+- **Re-importing wipes my edits** — re-import preserves rows where `modified=1` (manual moves) and rows the user deleted; only `modified=0` geometry is re-stamped from source. If you need a fresh start, use **Reset DB** in the Data section first.
--- a/index.html
+++ b/index.html
@@ -0,0 +1,14 @@
+<!doctype html>
+<html lang="en">
+  <head>
+    <meta charset="UTF-8" />
+    <link rel="icon" type="image/svg+xml" href="/vite.svg" />
+    <meta name="viewport" content="width=device-width, initial-scale=1.0" />
+    <title>Tauri + React + Typescript</title>
+  </head>
+
+  <body>
+    <div id="root"></div>
+    <script type="module" src="/src/main.tsx"></script>
+  </body>
+</html>
--- a/package-lock.json
+++ b/package-lock.json
--- a/package.json
+++ b/package.json
@@ -0,0 +1,33 @@
+{
+  "name": "kml_map_tool",
+  "private": true,
+  "version": "0.1.0",
+  "type": "module",
+  "scripts": {
+    "dev": "vite",
+    "build": "tsc && vite build",
+    "preview": "vite preview",
+    "tauri": "tauri"
+  },
+  "dependencies": {
+    "@deck.gl/core": "^9.3.1",
+    "@deck.gl/extensions": "^9.3.1",
+    "@deck.gl/layers": "^9.3.1",
+    "@deck.gl/mapbox": "^9.3.1",
+    "@tauri-apps/api": "^2",
+    "@tauri-apps/plugin-dialog": "^2.7.0",
+    "@tauri-apps/plugin-opener": "^2",
+    "deck.gl": "^9.3.1",
+    "maplibre-gl": "^5.24.0",
+    "react": "^19.1.0",
+    "react-dom": "^19.1.0"
+  },
+  "devDependencies": {
+    "@tauri-apps/cli": "^2",
+    "@types/react": "^19.1.8",
+    "@types/react-dom": "^19.1.6",
+    "@vitejs/plugin-react": "^4.6.0",
+    "typescript": "~5.8.3",
+    "vite": "^7.0.4"
+  }
+}
--- a/public/tauri.svg
+++ b/public/tauri.svg
@@ -0,0 +1,6 @@
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+</svg>
--- a/public/vite.svg
+++ b/public/vite.svg
@@ -0,0 +1 @@
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--- a/src-tauri/.gitignore
+++ b/src-tauri/.gitignore
@@ -0,0 +1,7 @@
+# Generated by Cargo
+# will have compiled files and executables
+/target/
+
+# Generated by Tauri
+# will have schema files for capabilities auto-completion
+/gen/schemas
--- a/src-tauri/Cargo.lock
+++ b/src-tauri/Cargo.lock
--- a/src-tauri/Cargo.toml
+++ b/src-tauri/Cargo.toml
@@ -0,0 +1,32 @@
+[package]
+name = "kml_map_tool"
+version = "0.1.0"
+description = "A Tauri App"
+authors = ["you"]
+edition = "2021"
+
+# See more keys and their definitions at https://doc.rust-lang.org/cargo/reference/manifest.html
+
+[lib]
+# The `_lib` suffix may seem redundant but it is necessary
+# to make the lib name unique and wouldn't conflict with the bin name.
+# This seems to be only an issue on Windows, see https://github.com/rust-lang/cargo/issues/8519
+name = "kml_map_tool_lib"
+crate-type = ["staticlib", "cdylib", "rlib"]
+
+[build-dependencies]
+tauri-build = { version = "2", features = [] }
+
+[dependencies]
+tauri = { version = "2", features = ["protocol-asset"] }
+tauri-plugin-opener = "2"
+tauri-plugin-dialog = "2"
+serde = { version = "1", features = ["derive"] }
+serde_json = "1"
+sqlx = { version = "0.8", default-features = false, features = ["runtime-tokio", "sqlite", "macros"] }
+tokio = { version = "1", features = ["rt-multi-thread", "macros", "sync", "fs"] }
+anyhow = "1"
+kml = "0.13"
+geo = "0.33"
+reqwest = { version = "0.12", default-features = false, features = ["rustls-tls", "json"] }
+
--- a/src-tauri/build.rs
+++ b/src-tauri/build.rs
@@ -0,0 +1,3 @@
+fn main() {
+    tauri_build::build()
+}
--- a/src-tauri/capabilities/default.json
+++ b/src-tauri/capabilities/default.json
@@ -0,0 +1,11 @@
+{
+  "$schema": "../gen/schemas/desktop-schema.json",
+  "identifier": "default",
+  "description": "Capability for the main window",
+  "windows": ["main"],
+  "permissions": [
+    "core:default",
+    "opener:default",
+    "dialog:default"
+  ]
+}
--- a/src-tauri/icons/128x128.png
+++ b/src-tauri/icons/128x128.png
--- a/src-tauri/icons/128x128@2x.png
+++ b/src-tauri/icons/128x128@2x.png
--- a/src-tauri/icons/32x32.png
+++ b/src-tauri/icons/32x32.png
--- a/src-tauri/icons/Square107x107Logo.png
+++ b/src-tauri/icons/Square107x107Logo.png
--- a/src-tauri/icons/Square142x142Logo.png
+++ b/src-tauri/icons/Square142x142Logo.png
--- a/src-tauri/icons/Square150x150Logo.png
+++ b/src-tauri/icons/Square150x150Logo.png
--- a/src-tauri/icons/Square284x284Logo.png
+++ b/src-tauri/icons/Square284x284Logo.png
--- a/src-tauri/icons/Square30x30Logo.png
+++ b/src-tauri/icons/Square30x30Logo.png
--- a/src-tauri/icons/Square310x310Logo.png
+++ b/src-tauri/icons/Square310x310Logo.png
--- a/src-tauri/icons/Square44x44Logo.png
+++ b/src-tauri/icons/Square44x44Logo.png
--- a/src-tauri/icons/Square71x71Logo.png
+++ b/src-tauri/icons/Square71x71Logo.png
--- a/src-tauri/icons/Square89x89Logo.png
+++ b/src-tauri/icons/Square89x89Logo.png
--- a/src-tauri/icons/StoreLogo.png
+++ b/src-tauri/icons/StoreLogo.png
--- a/src-tauri/icons/icon.icns
+++ b/src-tauri/icons/icon.icns
--- a/src-tauri/icons/icon.ico
+++ b/src-tauri/icons/icon.ico
--- a/src-tauri/icons/icon.png
+++ b/src-tauri/icons/icon.png
--- a/src-tauri/src/commands.rs
+++ b/src-tauri/src/commands.rs
--- a/src-tauri/src/db.rs
+++ b/src-tauri/src/db.rs
@@ -0,0 +1,247 @@
+use anyhow::Result;
+use sqlx::sqlite::{SqliteConnectOptions, SqlitePoolOptions};
+use sqlx::SqlitePool;
+use std::path::Path;
+use std::str::FromStr;
+
+pub async fn init_pool(db_path: &Path) -> Result<SqlitePool> {
+    if let Some(parent) = db_path.parent() {
+        tokio::fs::create_dir_all(parent).await?;
+    }
+
+    let url = format!("sqlite://{}", db_path.display());
+    let opts = SqliteConnectOptions::from_str(&url)?
+        .create_if_missing(true)
+        .journal_mode(sqlx::sqlite::SqliteJournalMode::Wal)
+        .synchronous(sqlx::sqlite::SqliteSynchronous::Normal);
+
+    let pool = SqlitePoolOptions::new()
+        .max_connections(4)
+        .connect_with(opts)
+        .await?;
+
+    apply_schema(&pool).await?;
+    Ok(pool)
+}
+
+async fn apply_schema(pool: &SqlitePool) -> Result<()> {
+    sqlx::query(
+        r#"
+        CREATE TABLE IF NOT EXISTS assets (
+            id           INTEGER PRIMARY KEY AUTOINCREMENT,
+            row_id       TEXT    NOT NULL UNIQUE,
+            asset_type   TEXT    NOT NULL CHECK (asset_type IN ('fixed','range')),
+            asset_name   TEXT    NOT NULL,
+            video_name   TEXT    NOT NULL,
+            lat          REAL,
+            lng          REAL,
+            start_lat    REAL,
+            start_lng    REAL,
+            end_lat      REAL,
+            end_lng      REAL,
+            min_lat      REAL    NOT NULL,
+            max_lat      REAL    NOT NULL,
+            min_lng      REAL    NOT NULL,
+            max_lng      REAL    NOT NULL,
+            image_path   TEXT,
+            image_path1  TEXT,
+            image_path2  TEXT,
+            image_path3  TEXT,
+            deleted      INTEGER NOT NULL DEFAULT 0,
+            modified     INTEGER NOT NULL DEFAULT 0,
+            modified_by  TEXT,
+            modified_at  TEXT,
+            merged_into  INTEGER REFERENCES assets(id),
+            in_scope     INTEGER
+        )
+        "#,
+    )
+    .execute(pool)
+    .await?;
+
+    sqlx::query("CREATE INDEX IF NOT EXISTS idx_assets_video ON assets(video_name)")
+        .execute(pool)
+        .await?;
+    sqlx::query("CREATE INDEX IF NOT EXISTS idx_assets_type ON assets(asset_type)")
+        .execute(pool)
+        .await?;
+    sqlx::query("CREATE INDEX IF NOT EXISTS idx_assets_name ON assets(asset_name)")
+        .execute(pool)
+        .await?;
+    // Migration: side detected from image_path (LHS/RHS) at import time.
+    let _ = sqlx::query("ALTER TABLE assets ADD COLUMN side TEXT")
+        .execute(pool)
+        .await;
+    // Manual scope override: NULL = derived from scope polygons (default),
+    // 0 = forced out-of-scope, 1 = forced in-scope. Set via lasso bulk edits.
+    let _ = sqlx::query("ALTER TABLE assets ADD COLUMN manual_scope INTEGER")
+        .execute(pool)
+        .await;
+    // Cross-side / cross-video pair links: link_pair_id is the partner asset's id.
+    // link_locked = 1 marks a manual link that survives auto-match re-runs.
+    let _ = sqlx::query("ALTER TABLE assets ADD COLUMN link_pair_id INTEGER")
+        .execute(pool)
+        .await;
+    let _ = sqlx::query(
+        "ALTER TABLE assets ADD COLUMN link_locked INTEGER NOT NULL DEFAULT 0",
+    )
+    .execute(pool)
+    .await;
+    // Original positions captured at import time. Never overwritten by edits or
+    // re-imports; used to support "Reset to original" (single + bulk).
+    for col in [
+        "orig_lat", "orig_lng",
+        "orig_start_lat", "orig_start_lng",
+        "orig_end_lat", "orig_end_lng",
+    ] {
+        let _ = sqlx::query(&format!("ALTER TABLE assets ADD COLUMN {} REAL", col))
+            .execute(pool)
+            .await;
+    }
+    let _ = sqlx::query("ALTER TABLE roads ADD COLUMN oneway INTEGER NOT NULL DEFAULT 0")
+        .execute(pool)
+        .await;
+    let _ = sqlx::query("ALTER TABLE roads ADD COLUMN highway TEXT")
+        .execute(pool)
+        .await;
+    sqlx::query(
+        "CREATE TABLE IF NOT EXISTS users (
+            id            INTEGER PRIMARY KEY AUTOINCREMENT,
+            username      TEXT NOT NULL UNIQUE,
+            display_name  TEXT NOT NULL,
+            created_at    TEXT NOT NULL DEFAULT (datetime('now'))
+        )",
+    )
+    .execute(pool)
+    .await?;
+
+    sqlx::query(
+        "CREATE VIRTUAL TABLE IF NOT EXISTS assets_rtree USING rtree(
+            id, min_lat, max_lat, min_lng, max_lng
+        )",
+    )
+    .execute(pool)
+    .await?;
+
+    sqlx::query(
+        "CREATE TRIGGER IF NOT EXISTS assets_ai AFTER INSERT ON assets
+         BEGIN
+            INSERT INTO assets_rtree(id, min_lat, max_lat, min_lng, max_lng)
+            VALUES (NEW.id, NEW.min_lat, NEW.max_lat, NEW.min_lng, NEW.max_lng);
+         END",
+    )
+    .execute(pool)
+    .await?;
+
+    sqlx::query(
+        "CREATE TRIGGER IF NOT EXISTS assets_au AFTER UPDATE ON assets
+         BEGIN
+            UPDATE assets_rtree
+              SET min_lat = NEW.min_lat, max_lat = NEW.max_lat,
+                  min_lng = NEW.min_lng, max_lng = NEW.max_lng
+            WHERE id = OLD.id;
+         END",
+    )
+    .execute(pool)
+    .await?;
+
+    sqlx::query(
+        "CREATE TRIGGER IF NOT EXISTS assets_ad AFTER DELETE ON assets
+         BEGIN
+            DELETE FROM assets_rtree WHERE id = OLD.id;
+         END",
+    )
+    .execute(pool)
+    .await?;
+
+    sqlx::query(
+        "INSERT INTO assets_rtree(id, min_lat, max_lat, min_lng, max_lng)
+         SELECT id, min_lat, max_lat, min_lng, max_lng FROM assets
+         WHERE id NOT IN (SELECT id FROM assets_rtree)",
+    )
+    .execute(pool)
+    .await?;
+
+    sqlx::query(
+        "CREATE TABLE IF NOT EXISTS scope_polygons (
+            id        INTEGER PRIMARY KEY AUTOINCREMENT,
+            name      TEXT,
+            geojson   TEXT NOT NULL,
+            geom_type TEXT NOT NULL DEFAULT 'polygon'
+        )",
+    )
+    .execute(pool)
+    .await?;
+    // Migration for DBs predating geom_type column.
+    let _ = sqlx::query(
+        "ALTER TABLE scope_polygons ADD COLUMN geom_type TEXT NOT NULL DEFAULT 'polygon'",
+    )
+    .execute(pool)
+    .await;
+
+    sqlx::query(
+        "CREATE TABLE IF NOT EXISTS roads (
+            id       INTEGER PRIMARY KEY AUTOINCREMENT,
+            name     TEXT,
+            geojson  TEXT NOT NULL,
+            min_lat  REAL NOT NULL,
+            max_lat  REAL NOT NULL,
+            min_lng  REAL NOT NULL,
+            max_lng  REAL NOT NULL
+        )",
+    )
+    .execute(pool)
+    .await?;
+    sqlx::query(
+        "CREATE VIRTUAL TABLE IF NOT EXISTS roads_rtree USING rtree(
+            id, min_lat, max_lat, min_lng, max_lng
+        )",
+    )
+    .execute(pool)
+    .await?;
+    sqlx::query(
+        "CREATE TRIGGER IF NOT EXISTS roads_ai AFTER INSERT ON roads
+         BEGIN
+            INSERT INTO roads_rtree(id, min_lat, max_lat, min_lng, max_lng)
+            VALUES (NEW.id, NEW.min_lat, NEW.max_lat, NEW.min_lng, NEW.max_lng);
+         END",
+    )
+    .execute(pool)
+    .await?;
+    sqlx::query(
+        "CREATE TRIGGER IF NOT EXISTS roads_ad AFTER DELETE ON roads
+         BEGIN
+            DELETE FROM roads_rtree WHERE id = OLD.id;
+         END",
+    )
+    .execute(pool)
+    .await?;
+
+    sqlx::query(
+        "CREATE TABLE IF NOT EXISTS action_history (
+            id          INTEGER PRIMARY KEY AUTOINCREMENT,
+            action_type TEXT    NOT NULL,
+            scope       TEXT    NOT NULL,
+            asset_ids   TEXT    NOT NULL,
+            user_id     TEXT    NOT NULL,
+            before      TEXT,
+            after       TEXT,
+            ts          TEXT    NOT NULL,
+            undone      INTEGER NOT NULL DEFAULT 0
+        )",
+    )
+    .execute(pool)
+    .await?;
+    // Migration for DBs created before `after` column existed.
+    let _ = sqlx::query("ALTER TABLE action_history ADD COLUMN after TEXT")
+        .execute(pool)
+        .await;
+    sqlx::query("CREATE INDEX IF NOT EXISTS idx_audit_ts ON action_history(ts DESC)")
+        .execute(pool)
+        .await?;
+    sqlx::query("CREATE INDEX IF NOT EXISTS idx_audit_undone ON action_history(undone)")
+        .execute(pool)
+        .await?;
+
+    Ok(())
+}
--- a/src-tauri/src/lib.rs
+++ b/src-tauri/src/lib.rs
@@ -0,0 +1,96 @@
+mod commands;
+mod db;
+mod scope;
+
+use commands::{
+    delete_asset, delete_assets_by_video, get_assets_in_bbox, get_osm_roads,
+    get_scope_polygons, import_fixed_assets, import_kml_scope, import_osm_geojson,
+    import_range_assets, list_assets, list_recent_actions, merge_polylines, reset_assets_to_original,
+    read_metadata_polyline, redo_action, reset_database, snap_assets_in_bbox,
+    add_class, auto_link_in_polygon, bulk_translate, change_assets_side, clear_link, clear_manual_scope,
+    create_osm_road, create_user, set_link,
+    delete_roads_by_highway, export_osm_roads, find_duplicate_clusters,
+    flip_road_direction, generate_osm_for_bbox, list_road_classes, merge_roads_by_name,
+    delete_assets_bulk, delete_osm_road, delete_user, export_assets,
+    list_asset_names, list_classes, list_users, list_video_names,
+    rename_assets, restore_assets, set_assets_by_video_in_scope,
+    set_assets_in_scope, set_current_user, snap_to_road,
+    undo_action, update_asset_position, update_osm_road, AppState,
+};
+use tauri::Manager;
+
+#[cfg_attr(mobile, tauri::mobile_entry_point)]
+pub fn run() {
+    tauri::Builder::default()
+        .plugin(tauri_plugin_opener::init())
+        .plugin(tauri_plugin_dialog::init())
+        .setup(|app| {
+            let app_data = app
+                .path()
+                .app_data_dir()
+                .expect("could not resolve app data dir");
+            let db_path = app_data.join("markers.db");
+
+            let handle = app.handle().clone();
+            tauri::async_runtime::block_on(async move {
+                let pool = db::init_pool(&db_path)
+                    .await
+                    .expect("failed to initialize SQLite pool");
+                handle.manage(AppState { pool });
+            });
+            Ok(())
+        })
+        .invoke_handler(tauri::generate_handler![
+            import_fixed_assets,
+            import_range_assets,
+            list_assets,
+            get_assets_in_bbox,
+            update_asset_position,
+            import_kml_scope,
+            get_scope_polygons,
+            delete_asset,
+            delete_assets_by_video,
+            undo_action,
+            list_recent_actions,
+            merge_polylines, reset_assets_to_original,
+            reset_database,
+            redo_action,
+            import_osm_geojson,
+            snap_to_road,
+            get_osm_roads,
+            read_metadata_polyline,
+            snap_assets_in_bbox,
+            update_osm_road,
+            create_osm_road,
+            delete_osm_road,
+            list_asset_names,
+            export_assets,
+            set_assets_in_scope,
+            set_assets_by_video_in_scope,
+            clear_manual_scope,
+            delete_assets_bulk,
+            list_video_names,
+            list_classes,
+            add_class,
+            rename_assets,
+            restore_assets,
+            list_users,
+            create_user,
+            delete_user,
+            set_current_user,
+            find_duplicate_clusters,
+            delete_roads_by_highway,
+            list_road_classes,
+            merge_roads_by_name,
+            export_osm_roads,
+            generate_osm_for_bbox,
+            flip_road_direction,
+            change_assets_side,
+            auto_link_in_polygon,
+            bulk_translate,
+            set_link,
+            clear_link
+        ])
+        .run(tauri::generate_context!())
+        .expect("error while running tauri application");
+}
--- a/src-tauri/src/main.rs
+++ b/src-tauri/src/main.rs
@@ -0,0 +1,6 @@
+// Prevents additional console window on Windows in release, DO NOT REMOVE!!
+#![cfg_attr(not(debug_assertions), windows_subsystem = "windows")]
+
+fn main() {
+    kml_map_tool_lib::run()
+}
--- a/src-tauri/src/scope.rs
+++ b/src-tauri/src/scope.rs
@@ -0,0 +1,270 @@
+use anyhow::Result;
+use geo::algorithm::Distance;
+use geo::{ClosestPoint, Closest, Contains, Coord, Geodesic, LineString, Point, Polygon as GeoPolygon};
+use kml::types::{Geometry as KmlGeom, Kml, Placemark};
+use sqlx::SqlitePool;
+use std::path::Path;
+
+/// Distance threshold for "near a scope LineString" → in_scope = 1.
+const LINE_PROXIMITY_M: f64 = 30.0;
+
+#[derive(Clone)]
+pub enum ScopeGeom {
+    Polygon(GeoPolygon<f64>),
+    Line(LineString<f64>),
+}
+
+pub struct ParsedFeature {
+    pub name: Option<String>,
+    pub geom: ScopeGeom,
+    pub geojson: String,
+    pub geom_type: &'static str,
+}
+
+pub async fn parse_kml(path: &Path) -> Result<Vec<ParsedFeature>> {
+    let s = tokio::fs::read_to_string(path).await?;
+    let kml: Kml = s.parse()?;
+    let mut out = vec![];
+    walk(&kml, None, &mut out);
+    Ok(out)
+}
+
+fn walk(kml: &Kml, parent_name: Option<&str>, out: &mut Vec<ParsedFeature>) {
+    match kml {
+        Kml::KmlDocument(doc) => {
+            for el in &doc.elements {
+                walk(el, parent_name, out);
+            }
+        }
+        Kml::Document { elements, .. } => {
+            for el in elements {
+                walk(el, parent_name, out);
+            }
+        }
+        Kml::Folder(folder) => {
+            for el in &folder.elements {
+                walk(el, folder.name.as_deref(), out);
+            }
+        }
+        Kml::Placemark(p) => {
+            let name = p.name.clone();
+            if let Some(g) = &p.geometry {
+                extract(g, name.as_deref(), p, out);
+            }
+        }
+        _ => {}
+    }
+}
+
+fn extract(g: &KmlGeom, name: Option<&str>, _p: &Placemark, out: &mut Vec<ParsedFeature>) {
+    match g {
+        KmlGeom::Polygon(poly) => {
+            let outer: Vec<Coord<f64>> = poly
+                .outer
+                .coords
+                .iter()
+                .map(|c| Coord { x: c.x, y: c.y })
+                .collect();
+            if outer.len() < 4 {
+                return;
+            }
+            let inners: Vec<LineString<f64>> = poly
+                .inner
+                .iter()
+                .map(|ring| {
+                    LineString(
+                        ring.coords
+                            .iter()
+                            .map(|c| Coord { x: c.x, y: c.y })
+                            .collect(),
+                    )
+                })
+                .collect();
+            let geo_poly = GeoPolygon::new(LineString(outer), inners);
+            let geojson = polygon_to_geojson(&geo_poly);
+            out.push(ParsedFeature {
+                name: name.map(|s| s.to_string()),
+                geom: ScopeGeom::Polygon(geo_poly),
+                geojson,
+                geom_type: "polygon",
+            });
+        }
+        KmlGeom::LineString(ls) => {
+            let pts: Vec<Coord<f64>> = ls
+                .coords
+                .iter()
+                .map(|c| Coord { x: c.x, y: c.y })
+                .collect();
+            if pts.len() < 2 {
+                return;
+            }
+            let line = LineString(pts);
+            let geojson = linestring_to_geojson(&line);
+            out.push(ParsedFeature {
+                name: name.map(|s| s.to_string()),
+                geom: ScopeGeom::Line(line),
+                geojson,
+                geom_type: "linestring",
+            });
+        }
+        KmlGeom::MultiGeometry(mg) => {
+            for sub in &mg.geometries {
+                extract(sub, name, _p, out);
+            }
+        }
+        _ => {}
+    }
+}
+
+fn polygon_to_geojson(p: &GeoPolygon<f64>) -> String {
+    let mut rings: Vec<Vec<[f64; 2]>> = vec![];
+    rings.push(p.exterior().0.iter().map(|c| [c.x, c.y]).collect());
+    for inner in p.interiors() {
+        rings.push(inner.0.iter().map(|c| [c.x, c.y]).collect());
+    }
+    serde_json::to_string(&serde_json::json!({
+        "type": "Polygon",
+        "coordinates": rings
+    }))
+    .unwrap_or_else(|_| "{}".to_string())
+}
+
+fn linestring_to_geojson(l: &LineString<f64>) -> String {
+    let coords: Vec<[f64; 2]> = l.0.iter().map(|c| [c.x, c.y]).collect();
+    serde_json::to_string(&serde_json::json!({
+        "type": "LineString",
+        "coordinates": coords
+    }))
+    .unwrap_or_else(|_| "{}".to_string())
+}
+
+pub async fn replace_scope(pool: &SqlitePool, features: &[ParsedFeature]) -> Result<()> {
+    let mut tx = pool.begin().await?;
+    sqlx::query("DELETE FROM scope_polygons")
+        .execute(&mut *tx)
+        .await?;
+    for f in features {
+        sqlx::query(
+            "INSERT INTO scope_polygons(name, geojson, geom_type) VALUES (?, ?, ?)",
+        )
+        .bind(&f.name)
+        .bind(&f.geojson)
+        .bind(f.geom_type)
+        .execute(&mut *tx)
+        .await?;
+    }
+    tx.commit().await?;
+    Ok(())
+}
+
+/// in_scope = inside any polygon OR within LINE_PROXIMITY_M of any LineString.
+/// Range assets are tagged by midpoint only (v1 limitation).
+pub async fn apply_scope_to_assets(
+    pool: &SqlitePool,
+    geoms: &[ScopeGeom],
+) -> Result<usize> {
+    if geoms.is_empty() {
+        // Reset only assets that don't have a manual override.
+        sqlx::query("UPDATE assets SET in_scope = NULL WHERE manual_scope IS NULL")
+            .execute(pool)
+            .await?;
+        return Ok(0);
+    }
+    let rows: Vec<(i64, Option<f64>, Option<f64>)> = sqlx::query_as(
+        "SELECT id, lat, lng FROM assets WHERE manual_scope IS NULL",
+    )
+    .fetch_all(pool)
+    .await?;
+    let mut tx = pool.begin().await?;
+    let mut tagged = 0usize;
+    for (id, lat, lng) in rows {
+        let in_scope = match (lat, lng) {
+            (Some(la), Some(lo)) => {
+                let p = Point::new(lo, la);
+                geoms.iter().any(|g| match g {
+                    ScopeGeom::Polygon(poly) => poly.contains(&p),
+                    ScopeGeom::Line(line) => match line.closest_point(&p) {
+                        Closest::SinglePoint(cp) | Closest::Intersection(cp) => {
+                            Geodesic.distance(p, cp) <= LINE_PROXIMITY_M
+                        }
+                        Closest::Indeterminate => false,
+                    },
+                })
+            }
+            _ => false,
+        };
+        sqlx::query("UPDATE assets SET in_scope = ? WHERE id = ?")
+            .bind(in_scope as i64)
+            .bind(id)
+            .execute(&mut *tx)
+            .await?;
+        tagged += 1;
+    }
+    tx.commit().await?;
+    Ok(tagged)
+}
+
+pub async fn load_geoms(pool: &SqlitePool) -> Result<Vec<ScopeGeom>> {
+    let rows: Vec<(String, String)> =
+        sqlx::query_as("SELECT geojson, geom_type FROM scope_polygons")
+            .fetch_all(pool)
+            .await?;
+    let mut out = vec![];
+    for (gj, gt) in rows {
+        let value = match serde_json::from_str::<serde_json::Value>(&gj) {
+            Ok(v) => v,
+            Err(_) => continue,
+        };
+        let coords = match value.get("coordinates") {
+            Some(c) => c,
+            None => continue,
+        };
+        if gt == "polygon" {
+            let arr = match coords.as_array() {
+                Some(a) => a,
+                None => continue,
+            };
+            let mut rings: Vec<LineString<f64>> = vec![];
+            for ring in arr {
+                if let Some(ring_arr) = ring.as_array() {
+                    let pts: Vec<Coord<f64>> = ring_arr
+                        .iter()
+                        .filter_map(|p| p.as_array())
+                        .filter_map(|p| {
+                            Some(Coord {
+                                x: p.first()?.as_f64()?,
+                                y: p.get(1)?.as_f64()?,
+                            })
+                        })
+                        .collect();
+                    if pts.len() >= 4 {
+                        rings.push(LineString(pts));
+                    }
+                }
+            }
+            if let Some(outer) = rings.first().cloned() {
+                let inners: Vec<LineString<f64>> = rings.into_iter().skip(1).collect();
+                out.push(ScopeGeom::Polygon(GeoPolygon::new(outer, inners)));
+            }
+        } else if gt == "linestring" {
+            let arr = match coords.as_array() {
+                Some(a) => a,
+                None => continue,
+            };
+            let pts: Vec<Coord<f64>> = arr
+                .iter()
+                .filter_map(|p| p.as_array())
+                .filter_map(|p| {
+                    Some(Coord {
+                        x: p.first()?.as_f64()?,
+                        y: p.get(1)?.as_f64()?,
+                    })
+                })
+                .collect();
+            if pts.len() >= 2 {
+                out.push(ScopeGeom::Line(LineString(pts)));
+            }
+        }
+    }
+    Ok(out)
+}
--- a/src-tauri/tauri.conf.json
+++ b/src-tauri/tauri.conf.json
@@ -0,0 +1,39 @@
+{
+  "$schema": "https://schema.tauri.app/config/2",
+  "productName": "kml_map_tool",
+  "version": "0.1.0",
+  "identifier": "com.seekright.kmlmap",
+  "build": {
+    "beforeDevCommand": "npm run dev",
+    "devUrl": "http://localhost:1420",
+    "beforeBuildCommand": "npm run build",
+    "frontendDist": "../dist"
+  },
+  "app": {
+    "windows": [
+      {
+        "title": "kml_map_tool",
+        "width": 800,
+        "height": 600
+      }
+    ],
+    "security": {
+      "csp": null,
+      "assetProtocol": {
+        "enable": true,
+        "scope": ["**"]
+      }
+    }
+  },
+  "bundle": {
+    "active": true,
+    "targets": "all",
+    "icon": [
+      "icons/32x32.png",
+      "icons/128x128.png",
+      "icons/128x128@2x.png",
+      "icons/icon.icns",
+      "icons/icon.ico"
+    ]
+  }
+}
--- a/src/App.css
+++ b/src/App.css
@@ -0,0 +1,706 @@
+html,
+body,
+#root {
+  height: 100%;
+  margin: 0;
+  padding: 0;
+  font-family: Inter, Avenir, Helvetica, Arial, sans-serif;
+  font-size: 14px;
+}
+
+.app {
+  position: relative;
+  height: 100vh;
+  width: 100vw;
+  overflow: hidden;
+}
+
+.map-area {
+  display: flex;
+  flex-direction: row;
+  height: 100%;
+  width: 100%;
+}
+
+.map-pane {
+  flex: 1 1 0;
+  min-width: 0;
+  height: 100%;
+  border-right: 1px solid #ccc;
+}
+
+.map-pane:last-child {
+  border-right: none;
+}
+
+.control-panel {
+  position: absolute;
+  top: 12px;
+  right: 12px;
+  z-index: 10;
+  background: rgba(255, 255, 255, 0.95);
+  padding: 8px 10px;
+  padding-right: 36px;
+  border-radius: 6px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
+  width: 200px;
+  font-size: 12px;
+}
+
+.control-panel h3 {
+  margin: 0 0 4px 0;
+  font-size: 12px;
+  font-weight: 600;
+  color: #333;
+}
+
+.control-panel .field {
+  margin-bottom: 6px;
+}
+
+.control-panel .field select {
+  padding: 3px 5px;
+  font-size: 12px;
+}
+
+.primary-btn {
+  font-size: 12px;
+  padding: 5px 8px;
+}
+
+.merge-slot {
+  padding: 4px 6px;
+  font-size: 11px;
+}
+
+.merge-label {
+  flex: 0 0 50px;
+}
+
+.panel-toggle {
+  position: absolute;
+  top: 12px;
+  right: 12px;
+  z-index: 11;
+  width: 32px;
+  height: 32px;
+  border-radius: 6px;
+  border: none;
+  background: rgba(255, 255, 255, 0.95);
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
+  cursor: pointer;
+  font-size: 16px;
+  line-height: 1;
+  color: #2c3e50;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.panel-toggle:hover {
+  background: #fff;
+}
+
+.control-panel h3 {
+  margin: 0 0 8px 0;
+  font-size: 14px;
+  font-weight: 600;
+}
+
+.control-panel .field {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+  margin-bottom: 10px;
+}
+
+.control-panel .field > span {
+  font-size: 12px;
+  color: #555;
+}
+
+.control-panel .field select {
+  padding: 6px 8px;
+  border: 1px solid #ccc;
+  border-radius: 4px;
+  background: #fff;
+  font-size: 13px;
+}
+
+.control-panel .field.checkbox {
+  flex-direction: row;
+  align-items: center;
+  gap: 8px;
+  margin-bottom: 0;
+}
+
+.control-panel .field.checkbox > span {
+  font-size: 13px;
+  color: #222;
+}
+
+.primary-btn {
+  width: 100%;
+  padding: 8px 10px;
+  background: #2980b9;
+  color: #fff;
+  border: none;
+  border-radius: 4px;
+  cursor: pointer;
+  font-size: 13px;
+}
+
+.primary-btn:disabled {
+  background: #95a5a6;
+  cursor: not-allowed;
+}
+
+.primary-btn:hover:not(:disabled) {
+  background: #2471a3;
+}
+
+.status {
+  margin-top: 8px;
+  font-size: 12px;
+  color: #444;
+  word-break: break-word;
+}
+
+.action-list {
+  list-style: none;
+  margin: 0;
+  padding: 0;
+  max-height: 240px;
+  overflow-y: auto;
+  border: 1px solid #eee;
+  border-radius: 4px;
+}
+
+.action-list li {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 6px;
+  padding: 4px 6px;
+  border-bottom: 1px solid #f1f1f1;
+  font-size: 11px;
+}
+
+.action-list li:last-child {
+  border-bottom: none;
+}
+
+.action-text {
+  flex: 1 1 auto;
+  min-width: 0;
+  word-break: break-word;
+}
+
+.undo-btn {
+  flex: 0 0 auto;
+  padding: 3px 8px;
+  background: #f1c40f;
+  color: #222;
+  border: none;
+  border-radius: 4px;
+  cursor: pointer;
+  font-size: 11px;
+}
+
+.undo-btn:hover:not(:disabled) {
+  background: #d4ac0d;
+}
+
+.undo-btn:disabled {
+  background: #ddd;
+  cursor: not-allowed;
+}
+
+.redo-btn {
+  flex: 0 0 auto;
+  padding: 3px 8px;
+  background: #27ae60;
+  color: #fff;
+  border: none;
+  border-radius: 4px;
+  cursor: pointer;
+  font-size: 11px;
+}
+
+.redo-btn:hover:not(:disabled) {
+  background: #1e8449;
+}
+
+.redo-btn:disabled {
+  background: #ddd;
+  cursor: not-allowed;
+}
+
+.action-list li.action-undone {
+  opacity: 0.55;
+  font-style: italic;
+}
+
+.thumb-row {
+  display: grid;
+  grid-template-columns: repeat(auto-fit, minmax(80px, 1fr));
+  gap: 6px;
+  margin-top: 6px;
+}
+
+.thumb {
+  display: block;
+  width: 100%;
+  padding: 0;
+  border: 1px solid #ddd;
+  border-radius: 4px;
+  background: #f5f5f5;
+  cursor: pointer;
+  overflow: hidden;
+}
+
+.thumb:hover {
+  border-color: #2980b9;
+}
+
+.thumb img {
+  display: block;
+  width: 100%;
+  height: 80px;
+  object-fit: cover;
+}
+
+.side-chip {
+  display: inline-block;
+  margin-left: 6px;
+  padding: 1px 6px;
+  border-radius: 10px;
+  font-size: 10px;
+  font-weight: 600;
+  vertical-align: middle;
+}
+
+.side-lhs,
+.side-left {
+  background: #fffbe6;
+  color: #d68910;
+  border: 1px solid #f1c40f;
+}
+
+.side-rhs,
+.side-right {
+  background: #ebf5fb;
+  color: #1f618d;
+  border: 1px solid #5dade2;
+}
+
+.hint {
+  margin-top: 6px;
+  font-size: 11px;
+  color: #666;
+  font-style: italic;
+}
+
+.layer-toggles {
+  display: flex;
+  flex-direction: column;
+  gap: 4px;
+}
+
+.layer-toggle {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  font-size: 12px;
+  color: #222;
+  cursor: pointer;
+}
+
+.layer-toggle input {
+  margin: 0;
+}
+
+/* MapLibre popup with inline image previews + caption */
+.asset-popup {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+  min-width: 240px;
+}
+
+.popup-imgs {
+  display: flex;
+  gap: 4px;
+  flex-wrap: wrap;
+}
+
+.popup-imgs img {
+  width: var(--popup-img-w, 440px);
+  height: var(--popup-img-h, 320px);
+  object-fit: cover;
+  border-radius: 4px;
+  background: #eee;
+}
+
+.popup-caption {
+  font-size: 13px;
+  color: #2c3e50;
+  line-height: 1.3;
+}
+
+.popup-caption strong {
+  font-size: 14px;
+}
+
+.popup-caption small {
+  color: #7f8c8d;
+  font-size: 11px;
+  word-break: break-all;
+}
+
+.side-tag {
+  display: inline-block;
+  margin-left: 6px;
+  padding: 1px 6px;
+  border-radius: 10px;
+  font-size: 10px;
+  font-weight: 600;
+}
+
+.side-tag.side-left,
+.side-tag.side-lhs {
+  background: #fffbe6;
+  color: #d68910;
+  border: 1px solid #f1c40f;
+}
+
+.side-tag.side-right,
+.side-tag.side-rhs {
+  background: #ebf5fb;
+  color: #1f618d;
+  border: 1px solid #5dade2;
+}
+
+.maplibregl-popup-content {
+  padding: 8px 10px !important;
+  border-radius: 6px !important;
+}
+
+/* S/M/E vertex pins for range editing */
+.vertex-pin {
+  width: 28px;
+  height: 28px;
+  border-radius: 50%;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: #fff;
+  font-weight: 700;
+  font-size: 12px;
+  border: 2px solid #fff;
+  box-shadow: 0 2px 6px rgba(0, 0, 0, 0.35);
+  cursor: grab;
+  user-select: none;
+}
+
+.vertex-pin.v-start { background: #2ecc71; }
+.vertex-pin.v-mid   { background: #f39c12; }
+.vertex-pin.v-end   { background: #e74c3c; }
+.vertex-pin.v-fixed { background: #1abc9c; }
+.vertex-pin.v-osm   { background: #ffd700; color: #222; width: 14px; height: 14px; font-size: 10px; }
+.vertex-pin.v-osm-ghost {
+  background: rgba(255, 215, 0, 0.45);
+  color: #222;
+  width: 11px;
+  height: 11px;
+  font-size: 11px;
+  line-height: 11px;
+  border: 1px dashed #b8860b;
+  cursor: copy;
+}
+.vertex-pin.v-osm-ghost:hover {
+  background: #ffd700;
+  border-style: solid;
+}
+
+.maplibregl-popup {
+  z-index: 10000 !important;
+}
+
+.user-chip {
+  position: absolute;
+  top: 12px;
+  right: 100px;
+  padding: 4px 10px;
+  background: rgba(67, 97, 238, 0.9);
+  color: #fff;
+  border-radius: 999px;
+  font-size: 12px;
+  font-weight: 600;
+  cursor: pointer;
+  z-index: 100;
+  box-shadow: 0 2px 4px rgba(0, 0, 0, 0.2);
+}
+.user-chip:hover {
+  background: #4361ee;
+}
+
+.lasso-circle,
+.lasso-rect {
+  position: absolute;
+  border: 2px solid #e91e63;
+  background: rgba(233, 30, 99, 0.15);
+  pointer-events: none;
+  z-index: 7;
+}
+.lasso-circle {
+  border-radius: 50%;
+}
+.lasso-rect {
+  border-radius: 2px;
+}
+
+/* Modal */
+.modal-backdrop {
+  position: fixed;
+  inset: 0;
+  background: rgba(0, 0, 0, 0.45);
+  z-index: 100;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+}
+
+.modal-card {
+  background: #fff;
+  border-radius: 8px;
+  width: 480px;
+  max-width: 92vw;
+  max-height: 86vh;
+  overflow: auto;
+  padding: 16px 18px;
+  box-shadow: 0 12px 32px rgba(0, 0, 0, 0.3);
+  position: relative;
+  font-size: 13px;
+  color: #222;
+}
+
+.modal-card h2 {
+  margin: 0 0 12px 0;
+  font-size: 16px;
+}
+
+.modal-card h4 {
+  margin: 14px 0 6px 0;
+  font-size: 13px;
+  color: #333;
+}
+
+.modal-close {
+  position: absolute;
+  top: 8px;
+  right: 12px;
+  background: transparent;
+  border: none;
+  font-size: 20px;
+  cursor: pointer;
+  color: #555;
+}
+
+.modal-close:hover { color: #000; }
+
+.size-picker {
+  display: flex;
+  gap: 6px;
+}
+
+.size-picker button {
+  flex: 1;
+  padding: 6px;
+  border: 1px solid #ccc;
+  background: #fafafa;
+  border-radius: 4px;
+  cursor: pointer;
+  font-size: 12px;
+}
+
+.size-picker button.active {
+  background: #2980b9;
+  color: #fff;
+  border-color: #2471a3;
+}
+
+/* Filters */
+.filter-section {
+  margin-top: 12px;
+}
+
+.filter-row {
+  display: flex;
+  align-items: center;
+  justify-content: space-between;
+  gap: 6px;
+  font-size: 11px;
+  color: #222;
+  padding: 2px 0;
+  cursor: pointer;
+}
+
+.filter-row input[type="checkbox"] {
+  margin: 0;
+  flex: 0 0 auto;
+}
+
+.filter-row .count {
+  flex: 0 0 auto;
+  font-size: 10px;
+  color: #888;
+  font-variant-numeric: tabular-nums;
+}
+
+.filter-row .label {
+  flex: 1 1 auto;
+  min-width: 0;
+  white-space: nowrap;
+  overflow: hidden;
+  text-overflow: ellipsis;
+}
+
+.filter-summary {
+  font-size: 11px;
+  color: #555;
+  margin-top: 4px;
+}
+
+.gear-btn {
+  position: absolute;
+  top: 12px;
+  right: 56px;
+  z-index: 11;
+  width: 32px;
+  height: 32px;
+  border-radius: 6px;
+  border: none;
+  background: rgba(255, 255, 255, 0.95);
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
+  cursor: pointer;
+  font-size: 16px;
+  display: flex;
+  align-items: center;
+  justify-content: center;
+  color: #2c3e50;
+}
+
+.gear-btn:hover { background: #fff; }
+
+.filter-panel {
+  position: absolute;
+  top: 12px;
+  left: 12px;
+  z-index: 10;
+  background: rgba(255, 255, 255, 0.95);
+  padding: 8px 10px;
+  padding-right: 36px;
+  border-radius: 6px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
+  width: 220px;
+  font-size: 12px;
+  max-height: calc(100vh - 24px);
+  overflow-y: auto;
+}
+
+.filter-panel h3 {
+  margin: 0 0 4px 0;
+  font-size: 12px;
+  font-weight: 600;
+  color: #333;
+}
+
+.filter-panel h4 {
+  margin: 8px 0 4px 0;
+  font-size: 11px;
+  font-weight: 600;
+  color: #555;
+  text-transform: uppercase;
+  letter-spacing: 0.5px;
+}
+
+.filter-close {
+  top: 4px !important;
+  right: 4px !important;
+  width: 26px !important;
+  height: 26px !important;
+  font-size: 14px !important;
+}
+
+.filter-open-btn {
+  position: absolute;
+  top: 12px;
+  left: 12px;
+  z-index: 11;
+  padding: 6px 12px;
+  background: rgba(255, 255, 255, 0.95);
+  border: none;
+  border-radius: 6px;
+  box-shadow: 0 2px 8px rgba(0, 0, 0, 0.2);
+  cursor: pointer;
+  font-size: 12px;
+  color: #2c3e50;
+}
+
+.filter-open-btn:hover { background: #fff; }
+
+.control-panel {
+  max-height: calc(100vh - 24px);
+  overflow-y: auto;
+}
+
+.merge-slots {
+  display: flex;
+  flex-direction: column;
+  gap: 6px;
+}
+
+.merge-slot {
+  display: flex;
+  align-items: center;
+  gap: 6px;
+  padding: 6px 8px;
+  border: 1px solid #eee;
+  border-radius: 4px;
+  font-size: 12px;
+}
+
+.merge-label {
+  flex: 0 0 60px;
+  color: #555;
+  font-weight: 500;
+}
+
+.merge-value {
+  flex: 1 1 auto;
+  min-width: 0;
+  font-size: 11px;
+  word-break: break-word;
+  color: #2c3e50;
+}
+
+.merge-pick {
+  flex: 0 0 auto;
+  padding: 3px 8px;
+  background: #34495e;
+  color: #fff;
+  border: none;
+  border-radius: 3px;
+  cursor: pointer;
+  font-size: 11px;
+}
+
+.merge-pick:hover:not(:disabled) {
+  background: #2c3e50;
+}
+
+.merge-pick:disabled {
+  background: #bdc3c7;
+  cursor: not-allowed;
+}
--- a/src/App.tsx
+++ b/src/App.tsx
--- a/src/LoginScreen.tsx
+++ b/src/LoginScreen.tsx
@@ -0,0 +1,247 @@
+import { useEffect, useState } from "react";
+import { invoke } from "@tauri-apps/api/core";
+
+type User = {
+  id: number;
+  username: string;
+  display_name: string;
+  created_at: string;
+};
+
+type Props = {
+  onLogin: (username: string, displayName: string) => void;
+};
+
+export function LoginScreen({ onLogin }: Props) {
+  const [users, setUsers] = useState<User[]>([]);
+  const [username, setUsername] = useState("");
+  const [displayName, setDisplayName] = useState("");
+  const [loading, setLoading] = useState(true);
+  const [error, setError] = useState<string>("");
+
+  const fetchUsers = async () => {
+    try {
+      const list = await invoke<User[]>("list_users");
+      setUsers(list);
+    } catch (e) {
+      setError(`Failed to fetch users: ${e}`);
+    } finally {
+      setLoading(false);
+    }
+  };
+
+  useEffect(() => {
+    fetchUsers();
+  }, []);
+
+  const handleLogin = async (u: User) => {
+    try {
+      await invoke("set_current_user", { username: u.username });
+      onLogin(u.username, u.display_name);
+    } catch (e) {
+      setError(`Login failed: ${e}`);
+    }
+  };
+
+  const handleCreate = async () => {
+    const uname = username.trim();
+    const dname = displayName.trim();
+    if (!uname || !dname) return;
+    try {
+      await invoke("create_user", { username: uname, displayName: dname });
+      setUsername("");
+      setDisplayName("");
+      await fetchUsers();
+    } catch (e) {
+      setError(`Failed to create user: ${e}`);
+    }
+  };
+
+  const handleDelete = async (u: User) => {
+    if (!confirm(`Delete user "${u.display_name}" (${u.username})?`)) return;
+    try {
+      await invoke("delete_user", { id: u.id });
+      await fetchUsers();
+    } catch (e) {
+      setError(`Failed to delete user: ${e}`);
+    }
+  };
+
+  return (
+    <div
+      style={{
+        display: "flex",
+        alignItems: "center",
+        justifyContent: "center",
+        height: "100vh",
+        width: "100vw",
+        background: "#1a1a2e",
+        color: "#e0e0e0",
+      }}
+    >
+      <div
+        style={{
+          background: "#16213e",
+          borderRadius: 12,
+          padding: 32,
+          minWidth: 380,
+          maxWidth: 460,
+          boxShadow: "0 8px 32px rgba(0,0,0,0.4)",
+        }}
+      >
+        <h1
+          style={{
+            textAlign: "center",
+            marginTop: 0,
+            marginBottom: 24,
+            fontSize: 22,
+          }}
+        >
+          KML Asset Editor
+        </h1>
+        {error && (
+          <div
+            style={{
+              background: "#5a1f1f",
+              color: "#ffd1d1",
+              padding: 8,
+              borderRadius: 4,
+              marginBottom: 12,
+              fontSize: 12,
+            }}
+          >
+            {error}
+          </div>
+        )}
+        {loading ? (
+          <p style={{ textAlign: "center", color: "#888" }}>Loading users…</p>
+        ) : (
+          <>
+            {users.length > 0 && (
+              <div style={{ marginBottom: 24 }}>
+                <h3 style={{ margin: "0 0 12px", fontSize: 14, color: "#aaa" }}>
+                  Existing users
+                </h3>
+                {users.map((u) => (
+                  <div
+                    key={u.id}
+                    style={{
+                      display: "flex",
+                      alignItems: "center",
+                      gap: 8,
+                      padding: "8px 12px",
+                      marginBottom: 6,
+                      background: "#0f3460",
+                      borderRadius: 6,
+                    }}
+                  >
+                    <span style={{ flex: 1 }}>
+                      <strong>{u.display_name}</strong>
+                      <span
+                        style={{
+                          color: "#888",
+                          marginLeft: 6,
+                          fontSize: 12,
+                        }}
+                      >
+                        @{u.username}
+                      </span>
+                    </span>
+                    <button
+                      onClick={() => handleLogin(u)}
+                      style={{
+                        padding: "4px 14px",
+                        borderRadius: 4,
+                        border: "none",
+                        cursor: "pointer",
+                        background: "#4361ee",
+                        color: "#fff",
+                        fontSize: 13,
+                        fontWeight: 600,
+                      }}
+                    >
+                      Login
+                    </button>
+                    <button
+                      onClick={() => handleDelete(u)}
+                      style={{
+                        padding: "4px 10px",
+                        borderRadius: 4,
+                        border: "none",
+                        cursor: "pointer",
+                        background: "#e63946",
+                        color: "#fff",
+                        fontSize: 13,
+                        fontWeight: 600,
+                      }}
+                    >
+                      Delete
+                    </button>
+                  </div>
+                ))}
+              </div>
+            )}
+            <div>
+              <h3 style={{ margin: "0 0 12px", fontSize: 14, color: "#aaa" }}>
+                Create new user
+              </h3>
+              <input
+                placeholder="Username"
+                value={username}
+                onChange={(e) => setUsername(e.target.value)}
+                style={{
+                  display: "block",
+                  width: "100%",
+                  padding: "8px 10px",
+                  marginBottom: 8,
+                  borderRadius: 4,
+                  border: "1px solid #333",
+                  background: "#1a1a2e",
+                  color: "#e0e0e0",
+                  fontSize: 14,
+                  boxSizing: "border-box",
+                }}
+              />
+              <input
+                placeholder="Display name"
+                value={displayName}
+                onChange={(e) => setDisplayName(e.target.value)}
+                onKeyDown={(e) => {
+                  if (e.key === "Enter") handleCreate();
+                }}
+                style={{
+                  display: "block",
+                  width: "100%",
+                  padding: "8px 10px",
+                  marginBottom: 12,
+                  borderRadius: 4,
+                  border: "1px solid #333",
+                  background: "#1a1a2e",
+                  color: "#e0e0e0",
+                  fontSize: 14,
+                  boxSizing: "border-box",
+                }}
+              />
+              <button
+                onClick={handleCreate}
+                style={{
+                  width: "100%",
+                  padding: "8px 0",
+                  borderRadius: 4,
+                  border: "none",
+                  cursor: "pointer",
+                  background: "#2ec4b6",
+                  color: "#fff",
+                  fontSize: 14,
+                  fontWeight: 600,
+                }}
+              >
+                Create user
+              </button>
+            </div>
+          </>
+        )}
+      </div>
+    </div>
+  );
+}
--- a/src/MapView.tsx
+++ b/src/MapView.tsx
--- a/src/assets/react.svg
+++ b/src/assets/react.svg
@@ -0,0 +1 @@
+<svg xmlns="http://www.w3.org/2000/svg" xmlns:xlink="http://www.w3.org/1999/xlink" aria-hidden="true" role="img" class="iconify iconify--logos" width="35.93" height="32" preserveAspectRatio="xMidYMid meet" viewBox="0 0 256 228"><path fill="#00D8FF" d="M210.483 73.824a171.49 171.49 0 0 0-8.24-2.597c.465-1.9.893-3.777 1.273-5.621c6.238-30.281 2.16-54.676-11.769-62.708c-13.355-7.7-35.196.329-57.254 19.526a171.23 171.23 0 0 0-6.375 5.848a155.866 155.866 0 0 0-4.241-3.917C100.759 3.829 77.587-4.822 63.673 3.233C50.33 10.957 46.379 33.89 51.995 62.588a170.974 170.974 0 0 0 1.892 8.48c-3.28.932-6.445 1.924-9.474 2.98C17.309 83.498 0 98.307 0 113.668c0 15.865 18.582 31.778 46.812 41.427a145.52 145.52 0 0 0 6.921 2.165a167.467 167.467 0 0 0-2.01 9.138c-5.354 28.2-1.173 50.591 12.134 58.266c13.744 7.926 36.812-.22 59.273-19.855a145.567 145.567 0 0 0 5.342-4.923a168.064 168.064 0 0 0 6.92 6.314c21.758 18.722 43.246 26.282 56.54 18.586c13.731-7.949 18.194-32.003 12.4-61.268a145.016 145.016 0 0 0-1.535-6.842c1.62-.48 3.21-.974 4.76-1.488c29.348-9.723 48.443-25.443 48.443-41.52c0-15.417-17.868-30.326-45.517-39.844Zm-6.365 70.984c-1.4.463-2.836.91-4.3 1.345c-3.24-10.257-7.612-21.163-12.963-32.432c5.106-11 9.31-21.767 12.459-31.957c2.619.758 5.16 1.557 7.61 2.4c23.69 8.156 38.14 20.213 38.14 29.504c0 9.896-15.606 22.743-40.946 31.14Zm-10.514 20.834c2.562 12.94 2.927 24.64 1.23 33.787c-1.524 8.219-4.59 13.698-8.382 15.893c-8.067 4.67-25.32-1.4-43.927-17.412a156.726 156.726 0 0 1-6.437-5.87c7.214-7.889 14.423-17.06 21.459-27.246c12.376-1.098 24.068-2.894 34.671-5.345a134.17 134.17 0 0 1 1.386 6.193ZM87.276 214.515c-7.882 2.783-14.16 2.863-17.955.675c-8.075-4.657-11.432-22.636-6.853-46.752a156.923 156.923 0 0 1 1.869-8.499c10.486 2.32 22.093 3.988 34.498 4.994c7.084 9.967 14.501 19.128 21.976 27.15a134.668 134.668 0 0 1-4.877 4.492c-9.933 8.682-19.886 14.842-28.658 17.94ZM50.35 144.747c-12.483-4.267-22.792-9.812-29.858-15.863c-6.35-5.437-9.555-10.836-9.555-15.216c0-9.322 13.897-21.212 37.076-29.293c2.813-.98 5.757-1.905 8.812-2.773c3.204 10.42 7.406 21.315 12.477 32.332c-5.137 11.18-9.399 22.249-12.634 32.792a134.718 134.718 0 0 1-6.318-1.979Zm12.378-84.26c-4.811-24.587-1.616-43.134 6.425-47.789c8.564-4.958 27.502 2.111 47.463 19.835a144.318 144.318 0 0 1 3.841 3.545c-7.438 7.987-14.787 17.08-21.808 26.988c-12.04 1.116-23.565 2.908-34.161 5.309a160.342 160.342 0 0 1-1.76-7.887Zm110.427 27.268a347.8 347.8 0 0 0-7.785-12.803c8.168 1.033 15.994 2.404 23.343 4.08c-2.206 7.072-4.956 14.465-8.193 22.045a381.151 381.151 0 0 0-7.365-13.322Zm-45.032-43.861c5.044 5.465 10.096 11.566 15.065 18.186a322.04 322.04 0 0 0-30.257-.006c4.974-6.559 10.069-12.652 15.192-18.18ZM82.802 87.83a323.167 323.167 0 0 0-7.227 13.238c-3.184-7.553-5.909-14.98-8.134-22.152c7.304-1.634 15.093-2.97 23.209-3.984a321.524 321.524 0 0 0-7.848 12.897Zm8.081 65.352c-8.385-.936-16.291-2.203-23.593-3.793c2.26-7.3 5.045-14.885 8.298-22.6a321.187 321.187 0 0 0 7.257 13.246c2.594 4.48 5.28 8.868 8.038 13.147Zm37.542 31.03c-5.184-5.592-10.354-11.779-15.403-18.433c4.902.192 9.899.29 14.978.29c5.218 0 10.376-.117 15.453-.343c-4.985 6.774-10.018 12.97-15.028 18.486Zm52.198-57.817c3.422 7.8 6.306 15.345 8.596 22.52c-7.422 1.694-15.436 3.058-23.88 4.071a382.417 382.417 0 0 0 7.859-13.026a347.403 347.403 0 0 0 7.425-13.565Zm-16.898 8.101a358.557 358.557 0 0 1-12.281 19.815a329.4 329.4 0 0 1-23.444.823c-7.967 0-15.716-.248-23.178-.732a310.202 310.202 0 0 1-12.513-19.846h.001a307.41 307.41 0 0 1-10.923-20.627a310.278 310.278 0 0 1 10.89-20.637l-.001.001a307.318 307.318 0 0 1 12.413-19.761c7.613-.576 15.42-.876 23.31-.876H128c7.926 0 15.743.303 23.354.883a329.357 329.357 0 0 1 12.335 19.695a358.489 358.489 0 0 1 11.036 20.54a329.472 329.472 0 0 1-11 20.722Zm22.56-122.124c8.572 4.944 11.906 24.881 6.52 51.026c-.344 1.668-.73 3.367-1.15 5.09c-10.622-2.452-22.155-4.275-34.23-5.408c-7.034-10.017-14.323-19.124-21.64-27.008a160.789 160.789 0 0 1 5.888-5.4c18.9-16.447 36.564-22.941 44.612-18.3ZM128 90.808c12.625 0 22.86 10.235 22.86 22.86s-10.235 22.86-22.86 22.86s-22.86-10.235-22.86-22.86s10.235-22.86 22.86-22.86Z"></path></svg>
--- a/src/basemaps.ts
+++ b/src/basemaps.ts
@@ -0,0 +1,133 @@
+import type { StyleSpecification } from "maplibre-gl";
+
+export type Basemap = {
+  id: string;
+  name: string;
+  style: StyleSpecification;
+};
+
+function rasterStyle(
+  sourceId: string,
+  tiles: string[],
+  attribution: string,
+  maxzoom = 19,
+): StyleSpecification {
+  return {
+    version: 8,
+    sources: {
+      [sourceId]: {
+        type: "raster",
+        tiles,
+        tileSize: 256,
+        attribution,
+        maxzoom,
+      },
+    },
+    layers: [
+      {
+        id: sourceId,
+        type: "raster",
+        source: sourceId,
+      },
+    ],
+  };
+}
+
+export const BASEMAPS: Basemap[] = [
+  {
+    id: "google-satellite",
+    name: "Google Satellite",
+    style: rasterStyle(
+      "google-satellite",
+      [
+        "https://mt0.google.com/vt/lyrs=y&hl=en&x={x}&y={y}&z={z}&s=Ga",
+        "https://mt1.google.com/vt/lyrs=y&hl=en&x={x}&y={y}&z={z}&s=Ga",
+        "https://mt2.google.com/vt/lyrs=y&hl=en&x={x}&y={y}&z={z}&s=Ga",
+        "https://mt3.google.com/vt/lyrs=y&hl=en&x={x}&y={y}&z={z}&s=Ga",
+      ],
+      "© Google",
+      22,
+    ),
+  },
+  {
+    id: "google-hybrid-zoomable",
+    name: "Google Satellite (deep zoom)",
+    style: rasterStyle(
+      "google-hybrid-zoomable",
+      [
+        "https://khms0.google.com/kh/v=996?x={x}&y={y}&z={z}",
+        "https://khms1.google.com/kh/v=996?x={x}&y={y}&z={z}",
+        "https://khms2.google.com/kh/v=996?x={x}&y={y}&z={z}",
+        "https://khms3.google.com/kh/v=996?x={x}&y={y}&z={z}",
+      ],
+      "© Google",
+      22,
+    ),
+  },
+  {
+    id: "esri-clarity",
+    name: "Esri Imagery Clarity",
+    style: rasterStyle(
+      "esri-clarity",
+      [
+        "https://clarity.maptiles.arcgis.com/arcgis/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}",
+      ],
+      "Tiles © Esri Clarity",
+      22,
+    ),
+  },
+  {
+    id: "osm",
+    name: "OpenStreetMap",
+    style: rasterStyle(
+      "osm",
+      ["https://tile.openstreetmap.org/{z}/{x}/{y}.png"],
+      "© OpenStreetMap contributors",
+      19,
+    ),
+  },
+  {
+    id: "esri-imagery",
+    name: "ArcGIS World Imagery",
+    style: rasterStyle(
+      "esri-imagery",
+      [
+        "https://services.arcgisonline.com/ArcGIS/rest/services/World_Imagery/MapServer/tile/{z}/{y}/{x}",
+      ],
+      "Tiles © Esri — Source: Esri, Maxar, Earthstar Geographics, and the GIS User Community",
+      19,
+    ),
+  },
+  {
+    id: "esri-street",
+    name: "ArcGIS World Street Map",
+    style: rasterStyle(
+      "esri-street",
+      [
+        "https://services.arcgisonline.com/ArcGIS/rest/services/World_Street_Map/MapServer/tile/{z}/{y}/{x}",
+      ],
+      "Tiles © Esri",
+      19,
+    ),
+  },
+  {
+    id: "opentopomap",
+    name: "OpenTopoMap",
+    style: rasterStyle(
+      "opentopomap",
+      [
+        "https://a.tile.opentopomap.org/{z}/{x}/{y}.png",
+        "https://b.tile.opentopomap.org/{z}/{x}/{y}.png",
+        "https://c.tile.opentopomap.org/{z}/{x}/{y}.png",
+      ],
+      "© OpenTopoMap (CC-BY-SA), © OpenStreetMap contributors",
+      17,
+    ),
+  },
+];
+
+export const DEFAULT_BASEMAP_ID = "google-hybrid-zoomable";
+
+export function basemapById(id: string): Basemap {
+  return BASEMAPS.find((b) => b.id === id) ?? BASEMAPS[0];
+}
--- a/src/colors.ts
+++ b/src/colors.ts
@@ -0,0 +1,34 @@
+// Stable video_name -> RGB hash (12-color palette).
+
+const PALETTE: ReadonlyArray<readonly [number, number, number]> = [
+  [231, 76, 60],
+  [52, 152, 219],
+  [46, 204, 113],
+  [241, 196, 15],
+  [155, 89, 182],
+  [230, 126, 34],
+  [26, 188, 156],
+  [233, 30, 99],
+  [3, 169, 244],
+  [205, 220, 57],
+  [255, 87, 34],
+  [121, 85, 72],
+];
+
+const cache = new Map<string, readonly [number, number, number]>();
+
+export function videoColorRGB(
+  name: string | null | undefined,
+): readonly [number, number, number] {
+  const key = name ?? "";
+  const hit = cache.get(key);
+  if (hit) return hit;
+  let h = 0;
+  for (let i = 0; i < key.length; i++) {
+    h = ((h << 5) - h + key.charCodeAt(i)) | 0;
+  }
+  const idx = ((h % PALETTE.length) + PALETTE.length) % PALETTE.length;
+  const c = PALETTE[idx];
+  cache.set(key, c);
+  return c;
+}
--- a/src/imagePath.ts
+++ b/src/imagePath.ts
@@ -0,0 +1,27 @@
+import { convertFileSrc } from "@tauri-apps/api/core";
+
+export function basename(p: string): string {
+  const s = p.replace(/\\/g, "/");
+  const i = s.lastIndexOf("/");
+  return i >= 0 ? s.slice(i + 1) : s;
+}
+
+export function resolveImageSrc(
+  url: string,
+  imageFolder: string | null,
+): string {
+  if (!url) return "";
+  // HTTP(S) wins over a local image folder. The image folder is meant to
+  // redirect *local* image_paths to a different on-disk location for offline
+  // viewing — it should not hijack remote URLs.
+  if (/^https?:\/\//i.test(url)) return url;
+  if (imageFolder) {
+    const sep =
+      imageFolder.endsWith("/") || imageFolder.endsWith("\\") ? "" : "/";
+    return convertFileSrc(`${imageFolder}${sep}${basename(url)}`);
+  }
+  if (url.startsWith("/") || /^[A-Za-z]:[\\/]/.test(url)) {
+    return convertFileSrc(url);
+  }
+  return url;
+}
--- a/src/main.tsx
+++ b/src/main.tsx
@@ -0,0 +1,9 @@
+import React from "react";
+import ReactDOM from "react-dom/client";
+import App from "./App";
+
+ReactDOM.createRoot(document.getElementById("root") as HTMLElement).render(
+  <React.StrictMode>
+    <App />
+  </React.StrictMode>,
+);
--- a/src/types.ts
+++ b/src/types.ts
@@ -0,0 +1,43 @@
+export type ScopePolygon = {
+  id: number;
+  name: string | null;
+  geojson: string;
+  geom_type: string;
+};
+
+export type ActionRow = {
+  id: number;
+  action_type: string;
+  scope: string;
+  asset_ids: string;
+  user_id: string;
+  before: string | null;
+  after: string | null;
+  ts: string;
+  undone: number;
+};
+
+export type Asset = {
+  id: number;
+  row_id: string;
+  asset_type: "fixed" | "range";
+  asset_name: string;
+  video_name: string;
+  lat: number | null;
+  lng: number | null;
+  start_lat: number | null;
+  start_lng: number | null;
+  end_lat: number | null;
+  end_lng: number | null;
+  image_path: string | null;
+  image_path1: string | null;
+  image_path2: string | null;
+  image_path3: string | null;
+  deleted: number;
+  modified: number;
+  merged_into: number | null;
+  in_scope: number | null;
+  side: string | null;
+  link_pair_id: number | null;
+  link_locked: number | null;
+};
--- a/src/vite-env.d.ts
+++ b/src/vite-env.d.ts
@@ -0,0 +1 @@
+/// <reference types="vite/client" />
--- a/test_scope_doha.kml
+++ b/test_scope_doha.kml
@@ -0,0 +1,22 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<kml xmlns="http://www.opengis.net/kml/2.2">
+  <Document>
+    <name>Doha test scope</name>
+    <Placemark>
+      <name>Doha rough scope</name>
+      <Polygon>
+        <outerBoundaryIs>
+          <LinearRing>
+            <coordinates>
+              51.350,25.500,0
+              51.550,25.500,0
+              51.550,25.800,0
+              51.350,25.800,0
+              51.350,25.500,0
+            </coordinates>
+          </LinearRing>
+        </outerBoundaryIs>
+      </Polygon>
+    </Placemark>
+  </Document>
+</kml>
--- a/tsconfig.json
+++ b/tsconfig.json
@@ -0,0 +1,26 @@
+{
+  "compilerOptions": {
+    "target": "ES2020",
+    "useDefineForClassFields": true,
+    "lib": ["ES2020", "DOM", "DOM.Iterable"],
+    "module": "ESNext",
+    "esModuleInterop": true,
+    "skipLibCheck": true,
+
+    /* Bundler mode */
+    "moduleResolution": "bundler",
+    "allowImportingTsExtensions": true,
+    "resolveJsonModule": true,
+    "isolatedModules": true,
+    "noEmit": true,
+    "jsx": "react-jsx",
+
+    /* Linting */
+    "strict": true,
+    "noUnusedLocals": true,
+    "noUnusedParameters": true,
+    "noFallthroughCasesInSwitch": true
+  },
+  "include": ["src"],
+  "references": [{ "path": "./tsconfig.node.json" }]
+}
--- a/tsconfig.node.json
+++ b/tsconfig.node.json
@@ -0,0 +1,10 @@
+{
+  "compilerOptions": {
+    "composite": true,
+    "skipLibCheck": true,
+    "module": "ESNext",
+    "moduleResolution": "bundler",
+    "allowSyntheticDefaultImports": true
+  },
+  "include": ["vite.config.ts"]
+}
--- a/vite.config.ts
+++ b/vite.config.ts
@@ -0,0 +1,32 @@
+import { defineConfig } from "vite";
+import react from "@vitejs/plugin-react";
+
+// @ts-expect-error process is a nodejs global
+const host = process.env.TAURI_DEV_HOST;
+
+// https://vite.dev/config/
+export default defineConfig(async () => ({
+  plugins: [react()],
+
+  // Vite options tailored for Tauri development and only applied in `tauri dev` or `tauri build`
+  //
+  // 1. prevent Vite from obscuring rust errors
+  clearScreen: false,
+  // 2. tauri expects a fixed port, fail if that port is not available
+  server: {
+    port: 1420,
+    strictPort: true,
+    host: host || false,
+    hmr: host
+      ? {
+          protocol: "ws",
+          host,
+          port: 1421,
+        }
+      : undefined,
+    watch: {
+      // 3. tell Vite to ignore watching `src-tauri`
+      ignored: ["**/src-tauri/**"],
+    },
+  },
+}));
				`@@ -0,0 +1 @@`
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